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Q: What number is the 2nd and 5th digits added eqal the 1st digit and the 2nd digit doubled equals the last digit and the last digit is a prime number amd the 3rd digit is four times the value of the las?

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What number when doubled has seven added and gives 13?

A natural number is doubled when added to its reciprocal. Find that number!

The number is 121/2.

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The no. is 35.

45

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There is no such number.

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(143 - 21)/2

In a measurement the digits that are an approximation are only those in proper scientific notation. The more digits that are added to the number the more the number becomes exact.

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Answer: 11It's a list of prime numbersQ:.....since when is 9 a prime number?Answer: 17It's not a list of primes, it's not a Fibonacci sequence. The only pattern I see is that the last number in the sequence gets a number added to it to produce the next number in the sequence, the number that's added doubles each time. E.g. 2+1 = 3 (1 is added)3+2 = 5 (1 is doubled = 2, then added)5+4 = 9 (2 is doubled = 4, then added)9+8 = 17 (4 is doubled = 8, then added)

1

Any number added to its negative equals zero.

-9.

357

-103

192

47

26

35 + 18 = 53

The number of significant figures in a number is equal to the number of digits to the left of the decimal point up to the first leading zero. It is then added to the number of total digits to the right of the decimal point. In this case, there are six significant digits.

There is a complement that when added equals one but you may be thinking of multiplying. A number times its reciprocal (multiplicative inverse) is equal to one. A number added to its additive inverse (opposite) is equal to zero.